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Which one of the following is not a biofertilizer?

1. Agrobacterium
2. Rhizobium
3. Nostoc
4. Mycorrhiza

Correct answer: Agrobacterium

Solution

Agrobacterium is not considered a biofertilizer; it is best known as a plant pathogen and as a tool in genetic engineering. Rhizobium, Nostoc, and Mycorrhiza are all used to enhance plant nutrition, so they are biofertilizers.

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